Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Left Headlight ECU Variation Error (B2456)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Exterior / Lighting (ext) / Lighting System(for Hv Model With Cornering Light) / Left Headlight ECU Variation Error (B2456)

DESCRIPTION

This DTC is stored if the headlight ECU sub-assembly LH for another destination is installed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2456

Left Headlight ECU Variation Error
  • The power switch is on (IG).
  • Vehicle specification information received via CAN communication is continuously mismatched
  • -
  • Hybrid vehicle control ECU
  • Main body ECU (multiplex network body ECU)
  • Headlight ECU sub-assembly LH

Headlight ECU sub-assembly LH

CAUTION / NOTICE / HINT

NOTICE:

  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here

  • Before replacing the hybrid vehicle control ECU, refer to Registration.

    Click here

PROCEDURE

1.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > HL AutoLeveling > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.

(e) Check for DTCs.

Body Electrical > HL AutoLeveling > Trouble Codes

OK:

DTC B2456 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

3.

CHECK HYBRID VEHICLE CONTROL ECU

(a) Check if the part number of the hybrid vehicle control ECU installed to the vehicle is correct.

OK:

Part number is correct.

NG

REPLACE HYBRID VEHICLE CONTROL ECU

OK

4.

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Check if the part number of the main body ECU (multiplex network body ECU) installed to the vehicle is correct.

OK:

Part number is correct.

OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Variation Code not Written (B2451)

    Back-up Light Circuit

    See More:

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    Toyota Avalon (XX50) 2019-2022 Owners Manual

    Toyota Avalon (XX50) 2019-2022 Service & Repair Manual

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